A novel YZnAlSiO microwave dielectric ceramic for microwave communication application as substrates.

Novel microwave dielectric ceramic YZnAlSiO were synthesized by solid-state route. The crystal structure of synthesized samples was characterized by X-ray diffraction and refined with Rietveld method. Microstructure and microwave dielectric properties of YZnAlSiO ceramics were investigated using Scanning Electron Microscopy and Hakki-Coleman method. X-ray data display that major phase of YZnAlSiO is isostructural to YAlO with a cubic garnet structure and space group of Ia-3d, which is composed of (Al/Si)O tetrahedron, (Zn/Al)O octahedron and YO dodecahedron, besides minor YSiO secondary phase. The distribution of grain sizes is closer to Gauss distribution. Bulk density of samples has a similar variation curve with Q* f of samples. YZnAlSiO ceramics exhibit excellent microwave dielectric properties: ε = 10.2, Q* f = 37938.2 (@9.47 GHz), τ = −31.7 ppm/°C at sintering temperature of 1500 °C. Our results indicate YZnAlSiO could be a potential material for millimeter wave communication systems as microwave substrates. [ABSTRACT FROM AUTHOR]